When parting and applying flat pin curls, you should begin at the concave end and create a curved parting in which direction?

When parting and applying flat pin curls, starting at the concave end and creating a curved parting in the opposite direction is essential for achieving the desired curl pattern and volume. This technique helps ensure that the curls will lie flatter against the scalp, which is particularly important for styles that require a smooth base or for those looking to create a sleek, polished finish.

By parting in the opposite direction, the hair not only secures the curl better but also allows for the natural flow of hair to complement the shape and style being worked on. This is a fundamental principle in styling, as it helps in creating contour and movement that follows the head's shape and enhances the overall aesthetic of the hairstyle.